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SP6201ER-3-3 Datasheet(PDF) 8 Page - Sipex Corporation |
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SP6201ER-3-3 Datasheet(HTML) 8 Page - Sipex Corporation |
8 / 10 page 8 Date:5/25/04 SP6200/6201 100/200mA CMOS LDO Regulator © Copyright 2004 Sipex Corporation equation: PD = (VIN - VOUT)*IOUT + VIN*IGND ≅ (VIN - VOUT) * IOUT Substituting PD(max) for PD and solving for the operating conditions that are critical to the ap- plication will give the maximum operating con- ditions for the regulator circuit. For example, if we are operating the SP6201- 3.0V at room temperature, with a SOT-23-5 package on a 4 layer standard board we can determine the maxi- mum input voltage for a set output current. PD(max) = (125 °C -25°C) = 1.1W (90 °C/W) To prevent the device from entering thermal shutdown, maximum power dissipation can not be exceeded. Using the output voltage of 3.0V and an output current of 200 mA, the maximum input voltage can be determined. Ground pin current can be taken from the electrical spec’s- table (I GND=200uA at IOUT=200uA). The maxi- mum input voltage is determined as follows: 1.1W = (VIN – 3.0V)*200mA + VIN*0.2mA Solving for VIN, we get: VIN = (1.1W + 0.6W) 200.2mA After calculations, we find that the maximum input voltage of a 3.0V application at 200mA of output current in an SOT-23-5 package is 8.4V. Dual-Supply Operation When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage must be diode clamped to ground. THEORY OF OPERATION: Continued |
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